Well if it was condemned at the Second Council of Constantinople then i imagine the Orthodox do not beleive there’s some pre existing pool of souls, i never much thought about it, certainly the Russian Orthodox and Greek Orthodox would agree on this.
Looking at the condemnation, it looked like a belief that souls weren't (or aren't) created was the problem. I think the RCC teaches that an individual's soul is created at conception, which would seem to take creation beyond the six days in Genesis. Greek Orthodox seems to teach something more along the line of a shared soul. Creation was complete in the six days mentioned in Genesis & children inherit their soul from their parents, in the same way they inherit their physical bodies.